基于冲击接地电阻的输电线路接地极形状优化

Grounding Electrode Shape Optimization of Power Transmission Line Based on Impulse Grounding Resistance

降低输电线路杆塔接地极的冲击接地电阻能有效防止线路遭受雷击。采用冲击系数法,对不同形状接地极的冲击接地电阻进行计算分析,得出冲击接地电阻随土壤电阻率增加而变大;随电极埋深变大而减小;随电极有效面积增大而减小。在此基础上改进接地极的形状,采用ETAP软件对改造后的接地极进行仿真计算,结果表明,改造后的接地极的冲击接地电阻明显减小,达到了较好的防雷效果。

To reduce transmission line pole and tower impulse grounding resistance can effectively prevent lines from lightning. The impulse coefficient method was adopted to calculate and to analyze the impulse grounding resistance of different grounding shapes, to get out the result that the impulse grounding resistance increases following soil resistance increasing, reduces following electrode buried depth increasing and re-duces following electrode effective area increasing. On this basis, the grounding electrode shape was improved. ETAP software was used to carry out simulation for the rebuilt impulse grounding resistance. The results show that the rebuilt impulse grounding resistance is obviously reduced, reaching better anti-lighting effect.